CN108374740A - A kind of cam and oil feed pump plunger driving device for driving fuel feeding pump plunger - Google Patents
A kind of cam and oil feed pump plunger driving device for driving fuel feeding pump plunger Download PDFInfo
- Publication number
- CN108374740A CN108374740A CN201810086154.5A CN201810086154A CN108374740A CN 108374740 A CN108374740 A CN 108374740A CN 201810086154 A CN201810086154 A CN 201810086154A CN 108374740 A CN108374740 A CN 108374740A
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- section
- cam
- reverse
- pump plunger
- actuating travel
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
Abstract
The invention discloses a kind of cams for driving fuel feeding pump plunger, wherein the cam for driving fuel feeding pump plunger（10）Including camshaft and at least one cam body being arranged on the camshaft（110）, the cam body（110）Including at least two symmetrically arranged effect bulge-structures（111）, bulge-structure is acted on described in each two（111）Each link position at be respectively formed the identical concave arc of recess radian（112）, the concave arc（112）It can be pair with described for driving the cam of fuel feeding pump plunger（10）The idler wheel to interact（20）It carries out self-positioning.The invention also discloses a kind of oil feed pump plunger driving devices.The self-positioning of idler wheel is realized provided by the present invention for driving the cam of fuel feeding pump plunger that idler wheel is enabled to be located in concave arc, and axial deflection occurs for the tappet body for preventing idler wheel and being connect with idler wheel.
Description
Technical field
The present invention relates to high pressure common rail fuel injection system technical fields, more particularly to one kind is for driving fuel feeding pump plunger shaft
The cam of plug and the oil feed pump plunger driving device for including the cam for being used to drive fuel feeding pump plunger.
Background technology
In fuel feeding driving mechanism, cam part is the driving force source of fuel feeding pump plunger, by matching resultant motion with it
Idler wheel and the driving oil feed pump piston reciprocation movement of tappet body are to realize oil supply function.
Traditional cam, idler wheel, tappet body driving structure, to prevent the idler wheel being arranged in above cam and tappet body from sending out
It gives birth to axial deflection and fuel feeding driving mechanism is caused stuck phenomenon occur, it usually needs dowel hole is set on the fuel feeding pump housing,
Dowel hole or slot are set on tappet body guide sleeve, the axis of tappet body and idler wheel is limited by the positioning pin on the pump housing
To rotation, achieve the purpose that limiting idler wheel and tappet body occurs axial deflection.This structure can be to avoid idler wheel and tappet body
Axial deflection, but there is also deficiencies for this structure, such as need to add on the fuel feeding pump housing and tappet body guide sleeve using positioning pin
The corresponding dowel hole of work or slot increase structural complexity and can improve processing, manufacture and assembly cost；For another example fixed
Position pin can exist there are phase separation with tappet body guide sleeve and rub, to increase confession when limiting tappet body axial rotation
The resistance of motion of oily driving mechanism.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art, provide a kind of for driving fuel feeding
The cam of pump plunger and the oil feed pump plunger driving device for including the cam for being used to drive fuel feeding pump plunger, it is existing to solve
The problems in technology.
As the first aspect of the invention, a kind of cam for driving fuel feeding pump plunger is provided, wherein the use
It is described at least one cam body that the cam of driving fuel feeding pump plunger includes camshaft and is arranged on the camshaft
Cam body includes at least two symmetrically arranged effect bulge-structures, and each connection of bulge-structure is acted on described in each two
Be respectively formed the identical concave arc of recess radian at position, the concave arc can pair with the cam for being used to drive fuel feeding pump plunger
The idler wheel to interact carries out self-positioning.
Preferably, the cam body includes two axisymmetric first effect bulge-structures and the second effect protrusion knot
Structure, the first effect bulge-structure includes the first actuating travel section θ1With the first reverse-running section θ5, the first actuating travel section θ1Lift
Curve and the first reverse-running section θ5Lifting curve be symmetrical arranged, and the first actuating travel section θ1With the first reverse-running section θ5
Corresponding central angle is 90 °, and the second effect bulge-structure includes the second actuating travel section θ1' and the second reverse-running section θ5', it is described
Second actuating travel section θ1' lifting curve and the second reverse-running section θ5' lifting curve be symmetrical arranged, and second actuating travel section
θ1' and the second reverse-running section θ5' corresponding central angle is 90 °, the first actuating travel section θ1With the second reverse-running section θ5’
Link position at formed the first concave arc, the first reverse-running section θ5With the second actuating travel section θ1' link position at formed
Second concave arc.
Preferably, the first actuating travel section θ1With the second actuating travel section θ1' include more than the forward direction for up stroke
String accelerating sections θ2, the first constant speed section θ3With positive sinusoidal braking section θ4, the first reverse-running section θ5With the second reverse-running section θ5’
Include the reversed sinusoidal accelerating sections θ for downward stroke6, the second constant speed section θ7With reversed cosine braking section θ8, described first
Actuating travel section θ1Up stroke lift equation form and the first reverse-running section θ5Downward stroke lift equation shape
Formula is identical.
Preferably, the positive cosine accelerating sections θ of the up stroke2Lift equation be：
Wherein,For the positive cosine accelerating sections θ2Corresponding first cam angle,θ2∈ [9 °,
15 °], C0For constant coefficient；
First constant speed section θ of the up stroke3Lift equation be：
Wherein,For the first constant speed section θ3Corresponding second cam angle,θ3∈ [54 °,
60 °], C1And C2It is constant coefficient；
The sinusoidal braking section θ of forward direction of the up stroke4Lift equation be：
Wherein,For the positive sinusoidal braking section θ4Corresponding third cam angle,θ4∈
[18 °, 24 °], C3、C4And C5It is constant coefficient.
Preferably, the cam body includes the first effect bulge-structure of three point symmetries, the second effect bulge-structure
Bulge-structure is acted on third, the first effect bulge-structure includes the first actuating travel section θ11With the first reverse-running section θ55, described
First actuating travel section θ11With the first reverse-running section θ55Corresponding central angle is 60 °, and the second effect bulge-structure includes
Second actuating travel section θ11' and the second reverse-running section θ55', the second actuating travel section θ11' and the second reverse-running section θ55' the corresponding center of circle
Angle is 60 °, and the third effect bulge-structure includes third actuating travel section θ11" and third reverse-running section θ55", the third rise
Section θ11" and the third reverse-running section θ55" corresponding central angle is 60 °, the first actuating travel section θ11With the third backhaul
Section θ55" link position at formed the first concave arc, the first reverse-running section θ55With the second actuating travel section θ11' link position
Place forms the second concave arc, the second reverse-running section θ55' and the third actuating travel section θ11" link position at formed third it is recessed
Arc.
Preferably, the first actuating travel section θ11, the second actuating travel section θ11' and the third actuating travel section θ11" include
Positive cosine accelerating sections θ for up stroke22, the first constant speed section θ33With positive sinusoidal braking section θ44, first backhaul
Section θ55, the second reverse-running section θ55' and the third reverse-running section θ55" include reversed sinusoidal accelerating sections for downward stroke
θ66, the second constant speed section θ77With reversed cosine braking section θ88, the first actuating travel section θ11Up stroke lift equation shape
Formula and the first reverse-running section θ55Downward stroke lift equation form it is identical.
Preferably, the positive cosine accelerating sections θ of the up stroke22Lift equation be：
Wherein,For the positive cosine accelerating sections θ22Corresponding first cam angle,θ22∈
[6 °, 10 °], C00For constant coefficient；
First constant speed section θ of the up stroke33Lift equation be：
Wherein,For the first constant speed section θ33Corresponding second cam angle,θ33∈
[36 °, 40 °], C11And C22It is constant coefficient；
The sinusoidal braking section θ of forward direction of the up stroke44Lift equation be：
Wherein,For the positive sinusoidal braking section θ44Corresponding third cam angle,θ44
∈ [12 °, 16 °], C33、C44And C55It is constant coefficient.
As the second aspect of the invention, a kind of oil feed pump plunger driving device is provided, wherein the fuel feeding pump plunger shaft
Plug driving device includes being previously described for the cam of driving fuel feeding pump plunger.
Preferably, the oil feed pump plunger driving device further includes idler wheel and the tappet body being connect with the idler wheel, described
Cam body can push the idler wheel and the tappet body to move axially in reciprocal fashion under the driving of the camshaft.
Provided by the present invention for driving the cam of fuel feeding pump plunger, due to being formed at the link position of bulge-structure
There is concave arc so that concave arc is interior to realize the self-positioning of idler wheel to cam with enabling to idler wheel to be located at when idler wheel contact interaction, prevents
Only axial deflection occurs for idler wheel and the tappet body being connect with idler wheel.
Oil feed pump plunger driving device provided by the invention, by forming concave arc on cam, effectively prevent idler wheel with
The axial deflection of tappet body reduces the complexity of structure.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, an and part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is tool provided by the invention cuing open there are two the cam for driving fuel feeding pump plunger of effect bulge-structure
Face structural schematic diagram.
Fig. 2 is that there are two the liters of the cam for driving fuel feeding pump plunger of effect bulge-structure for tool provided by the invention
Journey and acceleration plots.
Fig. 3 is that there are two the structural representations of the oil feed pump plunger driving device of effect bulge-structure for tool provided by the invention
Figure.
Fig. 4 is tool provided by the invention cuing open there are three the cam for driving fuel feeding pump plunger of effect bulge-structure
Face structural schematic diagram.
Fig. 5 is that there are three the liters of the cam for driving fuel feeding pump plunger of effect bulge-structure for tool provided by the invention
Journey and acceleration plots.
Fig. 6 is that there are three the structural representations of the oil feed pump plunger driving device of effect bulge-structure for tool provided by the invention
Figure.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific implementation mode stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
As the first aspect of the invention, provide a kind of cam for driving fuel feeding pump plunger, wherein such as Fig. 1 and
Shown in Fig. 4, the cam 10 for driving fuel feeding pump plunger includes camshaft (not shown) and is arranged in the cam
At least one cam body 110 on axis, the cam body 110 include at least two symmetrically arranged effect bulge-structures
111, the identical concave arc 112 of recess radian, institute are respectively formed at each link position of effect bulge-structure 111 described in each two
State concave arc 112 pair can make by oneself with the idler wheel 20 for driving the cam 10 of fuel feeding pump plunger to interact
Position.
Provided by the present invention for driving the cam of fuel feeding pump plunger, due to being formed at the link position of bulge-structure
There is concave arc so that concave arc is interior to realize the self-positioning of idler wheel to cam with enabling to idler wheel to be located at when idler wheel contact interaction, prevents
Only axial deflection occurs for idler wheel and the tappet body being connect with idler wheel.
It is understood that the wheel 10 includes camshaft and a cam body 110 being arranged on the camshaft
Or multiple cam bodies 110.
As a kind of specifically embodiment of the cam body 110, as shown in Figure 1, the cam body 110 wraps
Include two axisymmetric first effect bulge-structure 111a and the second effect bulge-structure 111b, the first effect protrusion knot
Structure 111a includes the first actuating travel section θ1With the first reverse-running section θ5, the first actuating travel section θ1Lifting curve and first backhaul
Section θ5Lifting curve be symmetrical arranged, and the first actuating travel section θ1With the first reverse-running section θ5Corresponding central angle is
90 °, the second effect bulge-structure 111b includes the second actuating travel section θ1' and the second reverse-running section θ5', second actuating travel section
θ1' lifting curve and the second reverse-running section θ5' lifting curve be symmetrical arranged, and the second actuating travel section θ1' and it is described
Second reverse-running section θ5' corresponding central angle is 90 °, the first actuating travel section θ1With the second reverse-running section θ5' connection position
It sets place and forms the first concave arc 112a, the first reverse-running section θ5With the second actuating travel section θ1' link position at formed second
Concave arc 112b.
Further specifically, the first actuating travel section θ1With the second actuating travel section θ1' include for up stroke
Positive cosine accelerating sections θ2, the first constant speed section θ3With positive sinusoidal braking section θ4, the first reverse-running section θ5With described second time
Journey section θ5' include reversed sinusoidal accelerating sections θ for downward stroke6, the second constant speed section θ7With reversed cosine braking section θ8, institute
State the first actuating travel section θ1Up stroke lift equation form and the first reverse-running section θ5Downward stroke lift side
The form of journey is identical.
The positive cosine accelerating sections θ of the up stroke2Lift equation be：
Wherein,For the positive cosine accelerating sections θ2Corresponding first cam angle,θ2∈ [9 °,
15 °], C0For constant coefficient；
First constant speed section θ of the up stroke3Lift equation be：
Wherein,For the first constant speed section θ3Corresponding second cam angle,θ3∈ [54 °,
60 °], C1And C2It is constant coefficient；
The sinusoidal braking section θ of forward direction of the up stroke4Lift equation be：
Wherein,For the positive sinusoidal braking section θ4Corresponding third cam angle,θ4∈
[18 °, 24 °], C3、C4And C5It is constant coefficient.
It should be noted that as seen from Figure 1, the first effect bulge-structure 111a and second effect are convex
It is symmetrical to play structure 111b, and the first reverse-running section θ5The lifting curve of downward stroke and the first actuating travel section θ1The liter of up stroke
Journey curve is symmetrical, therefore idler wheel and tappet body are in the first reverse-running section θ5The corresponding axial movement side of each section of lifting curve
Journey form is identical as actuating travel section θ 1, and the interval of each section of lifting curve is also identical.
It should be noted C0、C1、C2、C3、C4And C5It is the constant coefficient of equation, by the cam body 110
Lift and boundary condition determine.
As shown in Fig. 2, for tool shown in FIG. 1, there are two the cams for driving fuel feeding pump plunger of effect bulge-structure
Lifting curve 111-I and accelerating curve 111-II, the lifting curves and accelerating curve of two effect bulge-structures with
180 ° of axisymmetricals.In 180 ° of corners, the first actuating travel section θ of lifting curve 111-I1With the first reverse-running section θ5With 90 ° of axis
Symmetrically, it is minimum value at 0 ° and 180 °, i.e. lift is 0, reaches maximum value, i.e. maximum lift at 90 °.In 180 ° of corners, add
Rate curve 111-II reaches maximum value in 0 ° and 180 °, reaches minimum value at 90 ° also with 90 ° of axisymmetricals.With two
θ in the lifting curve 111-I and accelerating curve 111-II of the cam of a effect bulge-structure2The forward direction of corresponding up stroke
Cosine accelerating sections, θ3The constant speed section of corresponding up stroke, θ4The sinusoidal braking section of corresponding up stroke, θ6Corresponding downward stroke
Reversed sinusoidal accelerating sections, θ7The constant speed section of corresponding downward stroke, θ8The reversed cosine braking section of corresponding downward stroke.
There are two symmetrical effect protrusions in 360 ° of angle ranges there are two the cam of effect bulge-structure and tie in tool
Structure, and have the lifting curve 111- I and acceleration of the cam for driving fuel feeding pump plunger there are two effect bulge-structure
Curve 111-II is closed curve in 360 ° of angle ranges, therefore lifting curve 111-I and accelerating curve 111-II first
Reverse-running section θ5The reversed cosine braking section θ of downward stroke8Effect protrusion actuating travel section θ adjacent thereto1' up stroke forward direction cosine
Accelerating sections θ2' be mutually connected, and have the first backhaul of the cam for driving fuel feeding pump plunger there are two effect bulge-structure
Section θ5The reversed cosine braking section θ of downward stroke8Second actuating travel section θ of effect adjacent thereto1The cosine accelerating sections of ＇ up strokes
θ2' between can form the first concave arc 112a and the second concave arc 112b as shown in Figure 1.
When there are two the cams for driving fuel feeding pump plunger of effect bulge-structure to be applied to fuel feeding for previously described tool
When in pump plunger driving device, as shown in figure 3, the oil feed pump plunger driving device further includes idler wheel 20, tappet body 30, bullet
Spring gasket 40, tappet body guide sleeve 50, plunger 60, plunger spring 70 and plunger bushing 80.There are two the use of effect bulge-structure for tool
It is pushed under the driving of camshaft with its idler wheel 20 with resultant motion, tappet body 30 along axis in the cam of driving fuel feeding pump plunger
To reciprocating motion oil suction and Fuel injection system are realized to drive plunger 60 to move back and forth.Tappet body guide sleeve 50 is used for as rolling
Wheel 20 and tappet body 30 provide the guiding role of axially reciprocating, and plunger spring 70 is used in reciprocating motion to plunger 60
Apply downward reset thrust, preventing tool, there are two the cams and idler wheel for driving fuel feeding pump plunger of effect bulge-structure
20 fly off and generate shock, and spring shim 50 is used for the lower end of support plunger spring 70 and spring force is passed to plunger
60, plunger bushing 80 is used to be formed the cavity of oil suction and fuel feeding with plunger 60, realizes sucking and the pressure oil function of fuel oil, while column
Plug sleeve 80 is typically secured on the pump housing, can with the upper end of support plunger spring 70 and make thereon end position fix.
During the work time, in tool, there are two the lower of the cam for driving fuel feeding pump plunger of effect bulge-structure to stop
Point position, i.e. the first reverse-running section θ5The reversed cosine braking section θ of downward stroke8Second actuating travel section θ of effect adjacent thereto1＇ is upward
The cosine accelerating sections θ of stroke2There are this two sections of concave arcs of the first concave arc 112a and the second concave arc 112b between ＇, when fuel feeding pump plunger
When downward stroke moves to lower dead center, idler wheel 20 can be fallen driving device automatically under the down thrust effect of plunger spring 70
Enter in the first concave arc 112a or the second concave arc 112b, realize the self-positioning of axial direction, to avoid that axial deflection occurs.
As another specifically embodiment of the cam body 110, as shown in figure 4, the cam body 110
The first effect bulge-structure 121a, the second effect bulge-structure 121b and third including three point symmetries act on bulge-structure
121c, the first effect bulge-structure 121a includes the first actuating travel section θ11With the first reverse-running section θ55, first actuating travel section
θ11With the first reverse-running section θ55Corresponding central angle is 60 °, and the second effect bulge-structure 121b is pushed away including second
Journey section θ11' and the second reverse-running section θ55', the second actuating travel section θ11' and the second reverse-running section θ55' corresponding central angle is
60 °, the third effect bulge-structure 121c includes third actuating travel section θ11" and third reverse-running section θ55", the third actuating travel section
θ11" and the third reverse-running section θ55" corresponding central angle is 60 °, the first actuating travel section θ11With the third reverse-running section
θ55" link position at formed the first concave arc 122a, the first reverse-running section θ55With the second actuating travel section θ11' connection
The second concave arc 122b, the second reverse-running section θ is formed at position55' and the third actuating travel section θ11" link position at formed
Third concave arc 122c.
Specifically, the first actuating travel section θ11, the second actuating travel section θ11' and the third actuating travel section θ11" include
Positive cosine accelerating sections θ for up stroke22, the first constant speed section θ33With positive sinusoidal braking section θ44, first backhaul
Section θ55, the second reverse-running section θ55' and the third reverse-running section θ55" include reversed sinusoidal accelerating sections for downward stroke
θ66, the second constant speed section θ77With reversed cosine braking section θ88, the first actuating travel section θ11Up stroke lift equation shape
Formula and the first reverse-running section θ55Downward stroke lift equation form it is identical.
Further specifically, the positive cosine accelerating sections θ of the up stroke22Lift equation be：
Wherein,For the positive cosine accelerating sections θ22Corresponding first cam angle,θ22∈
[6 °, 10 °], C00For constant coefficient；
First constant speed section θ of the up stroke33Lift equation be：
Wherein,For the first constant speed section θ33Corresponding second cam angle,θ33∈
[36 °, 40 °], C11And C22It is constant coefficient；
The sinusoidal braking section θ of forward direction of the up stroke44Lift equation be：
Wherein,For the positive sinusoidal braking section θ44Corresponding third cam angle,θ44
∈ [12 °, 16 °], C33、C44And C55It is constant coefficient.
It is understood that the cam body 110 includes three along the circumferentially uniformly distributed effect bulge-structure of cam, this
Three effect bulge-structures are identical and point-symmetrically, the first reverse-running section θ55The lifting curve of downward stroke and the first rise
Section θ11The lifting curve of up stroke is symmetrical, therefore idler wheel and tappet body are in the first reverse-running section θ55Each section of lifting curve corresponds to
Axial movement equation form and actuating travel section θ11Identical, the interval of each section of lifting curve is also identical.
It should be noted that C00、C11、C22、C33、C44And C55It is the constant coefficient of equation, by the cam body 110
Lift and boundary condition determine.
As shown in figure 5, there are three the lifting curve 121-I and accelerating curve 121- of the cam of effect bulge-structure for tool
II, the lifting curve and accelerating curve of two neighboring effect bulge-structure are with 120 ° or 240 ° of axisymmetricals.Turn at 120 °
In angle, the first actuating travel section θ of lifting curve 121-I11With the first reverse-running section θ55It is minimum at 0 ° and 120 ° with 60 ° of axisymmetricals
Value, i.e. lift are 0, reach maximum value, i.e. maximum lift at 60 °.In 120 ° of corners, accelerating curve 121-II is also with 60 °
Axisymmetrical reaches maximum value in 0 ° and 120 °, reaches minimum value at 60 °.In the tool, there are three the convex of effect bulge-structure
θ in the lifting curve 121-I and accelerating curve 121-II of wheel22The positive cosine accelerating sections of corresponding up stroke, θ33It is corresponding
First constant speed section of up stroke, θ44The sinusoidal braking section of corresponding up stroke, θ66The reversed sine of corresponding downward stroke adds
Fast section, θ77Second constant speed section of corresponding downward stroke, θ88The reversed cosine braking section of corresponding downward stroke.
There are three the cams for acting on bulge-structure to be circumferentially evenly distributed with along cam there are three in 360 ° of angle ranges for the tool
Effect bulge-structure, and cam lifting curve 12-I and accelerating curve 121-II in 360 ° of angle ranges for be closed
Curve, therefore the reversed cosine of the downward stroke of lifting curve 121-I and the first reverse-running sections of accelerating curve 121-II θ 55 slows down
Section θ88Second actuating travel section θ of effect protrusion adjacent thereto11' up stroke forward direction cosine accelerating sections θ22' be mutually connected, and first
Reverse-running section θ55The reversed cosine braking section θ of downward stroke88Second actuating travel section θ adjacent thereto11' up stroke cosine accelerating sections
θ22' between can form the first concave arc 122a as shown in Figure 4, the second concave arc 122b and third concave arc 122c.
When there are three the cams for driving fuel feeding pump plunger of effect bulge-structure to be applied to fuel feeding for previously described tool
When in pump plunger driving device, as shown in fig. 6, the oil feed pump plunger driving device further includes idler wheel 20, tappet body 30, bullet
Spring gasket 40, tappet body guide sleeve 50, plunger 60, plunger spring 70 and plunger bushing 80.There are three the use of effect bulge-structure for tool
It is pushed under the driving of camshaft with its idler wheel 20 with resultant motion, tappet body 30 along axis in the cam of driving fuel feeding pump plunger
To reciprocating motion oil suction and Fuel injection system are realized to drive plunger 60 to move back and forth.Tappet body guide sleeve 50 is used for as rolling
Wheel 20 and tappet body 30 provide the guiding role of axially reciprocating, and plunger spring 70 is used in reciprocating motion to plunger 60
Apply downward reset thrust, preventing tool, there are three the cams and idler wheel for driving fuel feeding pump plunger of effect bulge-structure
20 fly off and generate shock, and spring shim 50 is used for the lower end of support plunger spring 70 and spring force is passed to plunger
60, plunger bushing 80 is used to form the cavity for being used for oil suction and fuel feeding with plunger 60, realizes sucking and the pressure oil function of fuel oil, together
When plunger bushing 80 be typically secured on the pump housing, can with the upper end of support plunger spring 70 and make thereon end position fix.
During the work time, because having, there are three the lower of the cam for being used to drive fuel feeding pump plunger of effect bulge-structure to stop
Point position, i.e. the first reverse-running section θ55The reversed cosine braking section θ of downward stroke88Second actuating travel section θ of effect adjacent thereto11' to
The cosine accelerating sections θ of upstroke22' between there are tri- sections of the first concave arc 122a, the second concave arc 122b and third concave arc 122c are recessed
Arc, so when oil feed pump plunger driving device is when downward stroke moves to lower dead center, idler wheel 20 is downward plunger spring 70
It can be automatically fallen under thrust in the first concave arc 122a, the second concave arc 122b and third concave arc 122c, realize axial direction
It is self-positioning, to avoid that axial deflection occurs.
Therefore, provided by the present invention for driving the cam of fuel feeding pump plunger in the reversed of cam reverse-running section downward stroke
Between cosine braking section and the positive cosine accelerating sections of actuating travel section up stroke, i.e., at the bottom dead center position of cam lifting curve
It is formed with concave arc.This section of concave arc can be such that cam top is realized certainly with its idler wheel with resultant motion when moving to lower dead center every time
Positioning, axial deflection can occur when being moved with Cam reciprocating to avoid idler wheel, so as to cancel positioning pin and oil feed pump
Dowel hole or slot on body and tappet body guide sleeve simplify fuel feeding pump configuration, reduce oil feed pump processing, manufacture and be assembled into
This, while cancelling positioning pin also and can eliminate oil feed pump plunger driving device because of positioning pin and tappet body guide sleeve generation phase interaction
With with friction and the increased resistance of motion.
As the second aspect of the invention, a kind of oil feed pump plunger driving device is provided, wherein such as Fig. 3 and Fig. 6 institutes
Show, the oil feed pump plunger driving device 1 includes the cam 10 for being previously described for driving fuel feeding pump plunger.
Oil feed pump plunger driving device provided by the invention, by forming concave arc on cam, effectively prevent idler wheel with
The axial deflection of tappet body reduces the complexity of structure.
Specifically, as shown in Figure 3 and Figure 6, the oil feed pump plunger driving device further include idler wheel 20 and with the idler wheel
20 connection tappet bodies 30, the cam body 110 can be pushed under the driving of the camshaft idler wheel and it is described very
Cylinder 30 moves axially in reciprocal fashion.
It should be understood that the oil feed pump plunger driving device 1 may include that previously described tool is convex there are two acting on
The cam for driving fuel feeding pump plunger of structure is played, can also include that there are three effect bulge-structures for previously described tool
Cam for driving fuel feeding pump plunger, in the same oil feed pump plunger driving device 1, there are three effect protrusions for tool
The cam for being used to drive fuel feeding pump plunger of structure is used to drive the convex of fuel feeding pump plunger than having there are two effect bulge-structure
Wheel moves back and forth upper more efficient in pushing rolling wheels and tappet body.
Specific implementation mode about the oil feed pump plunger driving device 1 is referred to be described above, no longer superfluous herein
It states.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary reality that uses
Mode is applied, however the present invention is not limited thereto.For those skilled in the art, the present invention is not being departed from
Spirit and essence in the case of, various changes and modifications can be made therein, these variations and modifications be also considered as the present invention protection
Range.
Claims (9)
1. a kind of cam for driving fuel feeding pump plunger, which is characterized in that the cam for driving fuel feeding pump plunger
(10) at least one cam body (110) for including camshaft and being arranged on the camshaft, cam body (110) packet
At least two symmetrically arranged effect bulge-structures (111) are included, each connection position of bulge-structure (111) is acted on described in each two
The place of setting is respectively formed the identical concave arc (112) of recess radian, and the concave arc (112) can be pair with described for driving fuel feeding pump plunger
The idler wheel (20) that interacts of cam (10) carry out it is self-positioning.
2. the cam according to claim 1 for driving fuel feeding pump plunger, which is characterized in that the cam body
(110) include two it is axisymmetric first effect bulge-structures (111a) and second act on bulge-structure (111b), described first
It includes the first actuating travel section (θ to act on bulge-structure (111a)1) and the first reverse-running section (θ5), the first actuating travel section (θ1) lift
Curve and the first reverse-running section (θ5) lifting curve be symmetrical arranged, and the first actuating travel section (θ1) and the first backhaul
Section (θ5) corresponding central angle is 90 °, the second effect bulge-structure (111b) includes the second actuating travel section (θ1') and second
Reverse-running section (θ5'), the second actuating travel section (θ1') lifting curve and the second reverse-running section (θ5') lifting curve symmetrically set
It sets, and the second actuating travel section (θ1') and the second reverse-running section (θ5') corresponding central angle is 90 °, first rise
Section (θ1) and the second reverse-running section (θ5') link position at formed the first concave arc (112a), the first reverse-running section (θ5) with
Second actuating travel section (the θ1') link position at formed the second concave arc (112b).
3. the cam according to claim 2 for driving fuel feeding pump plunger, which is characterized in that first actuating travel section
(θ1) and the second actuating travel section (θ1') include positive cosine accelerating sections (θ for up stroke2), the first constant speed section (θ3)
With positive sinusoidal braking section (θ4), the first reverse-running section (θ5) and the second reverse-running section (θ5') include being used for downward stroke
Reversed sinusoidal accelerating sections (θ6), the second constant speed section (θ7) and reversed cosine braking section (θ8), the first actuating travel section (θ1) to
The form of the lift equation of upstroke and the first reverse-running section (θ5) downward stroke lift equation form it is identical.
4. the cam according to claim 3 for driving fuel feeding pump plunger, which is characterized in that the up stroke is just
To cosine accelerating sections (θ2) lift equation be：
Wherein,For the positive cosine accelerating sections (θ2) corresponding first cam angle,θ2∈ [9 °, 15 °],
C0For constant coefficient；
First constant speed section (θ of the up stroke3) lift equation be：
Wherein,For the first constant speed section (θ3) corresponding second cam angle,θ3∈ [54 °,
60 °], C1And C2It is constant coefficient；
Sinusoidal braking section (the θ of forward direction of the up stroke4) lift equation be：
Wherein,For the positive sinusoidal braking section (θ4) corresponding third cam angle,θ4∈
[18 °, 24 °], C3、C4And C5It is constant coefficient.
5. the cam according to claim 1 for driving fuel feeding pump plunger, which is characterized in that the cam body
(110) include that the first effect bulge-structure (121a), the second effect bulge-structure (121b) and third of three point symmetries acts on
Bulge-structure (121c), the first effect bulge-structure (121a) includes the first actuating travel section (θ11) and the first reverse-running section (θ55),
First actuating travel section (the θ11) and the first reverse-running section (θ55) corresponding central angle is 60 °, the second effect protrusion knot
Structure (121b) includes the second actuating travel section (θ11') and the second reverse-running section (θ55'), the second actuating travel section (θ11') and it is second time described
Journey section (θ55') corresponding central angle is 60 °, the third effect bulge-structure (121c) includes third actuating travel section (θ11") and
Third reverse-running section (θ55"), the third actuating travel section (θ11") and the third reverse-running section (θ55") corresponding central angle is 60 °,
First actuating travel section (the θ11) and the third reverse-running section (θ55") link position at form the first concave arc (122a), described the
One reverse-running section (θ55) and the second actuating travel section (θ11') link position at formed the second concave arc (122b), second backhaul
Section (θ55') and the third actuating travel section (θ11") link position at formed third concave arc (122c).
6. the cam according to claim 5 for driving fuel feeding pump plunger, which is characterized in that first actuating travel section
(θ11), the second actuating travel section (θ11') and the third actuating travel section (θ11") include adding for the positive cosine of up stroke
Fast section (θ22), the first constant speed section (θ33) and positive sinusoidal braking section (θ44), the first reverse-running section (θ55), second backhaul
Section (θ55') and the third reverse-running section (θ55") include reversed sinusoidal accelerating sections (θ for downward stroke66), the second constant speed
Section (θ77) and reversed cosine braking section (θ88), the first actuating travel section (θ11) up stroke lift equation form and institute
State the first reverse-running section (θ55) downward stroke lift equation form it is identical.
7. the cam according to claim 6 for driving fuel feeding pump plunger, which is characterized in that the up stroke is just
To cosine accelerating sections (θ22) lift equation be：
Wherein,For the positive cosine accelerating sections (θ22) corresponding first cam angle,θ22∈ [6 °,
10 °], C00For constant coefficient；
First constant speed section (θ of the up stroke33) lift equation be：
Wherein,For the first constant speed section (θ33) corresponding second cam angle,θ33∈
[36 °, 40 °], C11And C22It is constant coefficient；
Sinusoidal braking section (the θ of forward direction of the up stroke44) lift equation be：
Wherein,For the positive sinusoidal braking section (θ44) corresponding third cam angle,θ44∈
[12 °, 16 °], C33、C44And C55It is constant coefficient.
8. a kind of oil feed pump plunger driving device, which is characterized in that the oil feed pump plunger driving device (1) includes claim
The cam (10) for driving fuel feeding pump plunger described in any one of 1 to 7.
9. oil feed pump plunger driving device according to claim 8, which is characterized in that the oil feed pump plunger driving device
Further include idler wheel (20) and the tappet body (30) being connect with the idler wheel (20), the cam body (110) can be described convex
The idler wheel and the tappet body (30) is pushed to move axially in reciprocal fashion under the driving of wheel shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810086154.5A CN108374740A (en) | 2018-01-29 | 2018-01-29 | A kind of cam and oil feed pump plunger driving device for driving fuel feeding pump plunger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810086154.5A CN108374740A (en) | 2018-01-29 | 2018-01-29 | A kind of cam and oil feed pump plunger driving device for driving fuel feeding pump plunger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108374740A true CN108374740A (en) | 2018-08-07 |
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ID=63016951
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810086154.5A Pending CN108374740A (en) | 2018-01-29 | 2018-01-29 | A kind of cam and oil feed pump plunger driving device for driving fuel feeding pump plunger |
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| Country | Link |
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| CN (1) | CN108374740A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020061834A1 (en) * | 2018-09-26 | 2020-04-02 | 唐山哈船科技有限公司 | Double-action cam for fuel pump, and fuel pump driving mechanism |
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| WO2020061834A1 (en) * | 2018-09-26 | 2020-04-02 | 唐山哈船科技有限公司 | Double-action cam for fuel pump, and fuel pump driving mechanism |
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